My humble opinion:

taibbi really has uncritically joined with the right. He has adopted so many of their priorities entirely at the expense of his own previous ones. I think he sees this rather cynically as his best career opportunity.

Greenwald, like many others including actually Ralph Nader, is simply a left-right alliance guy who sees some issues of common cause alongside other issues of difference, and is not intimidated to ally on the common causes. There are a number of principled US libertarians who are actually among the fiercest consumer advocates, the boldest privacy advocates, the most committed right-to-repair advocates. antiwar.com is libertarian, nakedcapitalism is libertarian, unz.com is libertarian, Judge Nap, etc. and they all get posted here, all are principled and committed, some are willing to share their audiences with people like Max Blumenthal, while many on the opposite side we refer to now as the “so called left”. I don’t see what Greenwald and Dore are doing as a betrayal, I see it as an opportunity to reach and convert a wider audience - an audience perhaps with some form of a sense of injustice that has traditionally been expressed in other ways.